Sound-amplifier.



J. J. WARD.

souwn AMPLIFIER.

APPLICATION FILED SEPT. 19. I91]v 1,301,526. Patented Apr. 22,1919.

UNITED STATES PATENT oEEIoE.

JAMES J. WARD, 0F GREENE, OHIO, ASSIGNOR OF THIRTY-FIVE ONE-HUNDREDTHS TO IVO C. DE BEUGKELAEBE AND TWENTY ONE-HUNDREDTHS TO WALTER G.

IATTEEWS, BOTH 0F DAYTON, OHIO.

- scum-AMPLIFIER.

Specification of Letters Patent.

Application filed September 19, 1917. Serial No. 192,184.

To all whom it may concern:

Be it known that 1, JAMES J. WARD, a citizen of the United States, residing in the county of Greene, near the town of Fair'field, State of Ohio, have invented new and useful Improvements in Sound-Amplifiers, of which the following is a specification.

This invention relates to new and useful.

improvements in sound amplifiers.

The principal object of the invention is to provide a sound amplifier which is especially adapted for aviation service. It is particularly designed to meet the needs of aviation instruction work, since the instrument will not accept the sound of the motor and other moving parts, to the end that the instructor may talk in a low tone to one'or more students accompanyinghim, without the necessity of using his hands or other means for signaling. directions to them. The receivers, which are applied to the ears of the student, will so magnify the voice of the instructor, that everything he says will be plainly audible amidst the almostdeafening noise of the motor and parts. I

My device is also particularly useful in war observation work, since it enables the operator of the machine to converse with the observer under the most noisy and-trying circumstances. 7

The instrument is not limited, however, in its application to aviation instruction and observation service, but it ma be useful in boats, buildings and other p aces where it is desired to transmit vocal and other sounds free from the disturbance created. by extraneous noises.

The preferred form of embodiment of my invention is illustrated in the accompanying drawings, of which Figure 1 is a side other rotating elevational view of my sound, amplifiem, gms in dotted responding In a deta' ed description of the preferred form of embodiment of my invention, the numeral 1' designates a preferabl ,bellshaped mouth piece to the rear end 0 which a line of rubber or other'flexible tubin 2 is suitably connected. The other end 0 this tubing is connected to a, tubular Y 3, to each fork of which a piece of flexible tubing 4 is secured. I

To the free end of each of the tubes 4:, there is connected a receiver 5 constructed as follows. Each receiver preferably comprises a hollow metallic member circular in cross section, and which is closed at the bottom and open at the top. (See Figs. 2 and 3). Its shape is similar tothat of the ordinary Vaseline box with the top removed. However, it may be of any other form or shape that willenable it to be readily fitted to the human car, without departing from the spirit of my invention.

At one point within the circular rim or receiver 5 there is provided a preferably circular'hole 6, from which a preferably corrugated tubular boss 7 extends outwardly to receive and hold firmly thereto, the free end of one of the tubes 4. (See Figs. 1 and 3.)

For the purpose of amplifying the sounds received from the tubes 4, each of the receivers 5 contains a circular diaphragm 8. One end of this diaphragm is preferably soldered to the'bottomof its respective receiver 5, at a point directly opposite the hole 6 therein, in such a manner that the opposite end-of said diaphragm may approximately extend to the lateral plane of the horizontal axis of said hole.

Each diaphragm 8'has a slight clearance within its respective. receiver 5 so that its free end may vibrate in responseto the sound waves entering the hole 6. In order that it may be more sensitive to said waves and vibrate more freely to magnify them for presentation to the ear of the auditor, the diaphragm 8-has formed in itscircular edge opposite the hole 6-, va ipreferably semicircu- Patented Apr. 22, 1919.

occupying his seat in the machine, the instructor firmly and comfortably secures the mouth piece l'to his face so that he may which he will not hear. other sounds may be freely and distinctly talk directly therein while keeping his eyes to the front. The student'at the same time holds or otherwise secures the receivers 5 to his ears,.and as the instructor talks to him in a low, direct tone, the sounds emitted by him will be so amplifiedbythe instrument, that his directions Will be distinctly audible to the student notwithstanding the noise ofthewhirling motorand other parts, In a like manner transmitted,- free from the disturbance created by extraneous noises.

I do not wish to be 11m1ted to the details of construction and arrangement herein shown and described, and any changes or modifications may be made therein within the scope of the subjoined claims.

Having described my invention, I claim z 1. A sound amplifier comprising a hollow member closed at one end, and having a hole in the side portion thereof to admit sound waves, and a diaphragm within said member, one end of-which is secured to the latter in such a manner as to project its other end into the direct path of thesound waves entering the member through; said hole, for a vibratory movement by said Waves.

2. A sound amplifier comprisinga hollow member closed at one end, and having ahole in its side portion to admit sound waves, and a diaphragm having a notched'portio'n, laterally disposed within said member, the end ofsaid diaphragm'opposite its notched portion being secured within said member in such a manner asto project said notched portion into the direct path of the sound waves entering the member through said her .- hole, for i a vibratory movement by said 40 Waves.

3, A sound amplifier com-prising a 'hollow-cylinder having .a hole in its side portion to admit sound waves, a bottom for said cylinder, a-flat diaphragm, of slightly less diameter than said bottom, laterally disclosed at one end and having a hole in its side portion, a flexible tube connecting said mouth piece and hollow cylinder in such a the former to enter the latter-through said hole,-and .a diaphragm h i notched portion, laterally disposed within said hob low member, the end. of saiddiaphragm opwithin said member in such a manner as to project said notched portion into the direct path of the sound waves enterlng the memwaves.

In testimony whereof I have hereunto set myhand this 17th-day of September, 1917; JAMES J. I

Witness: a

H; S. SETH,

manner as to permitthe sound waves from e5 posite 'its' notched portion lacing secured fromthe mouth piece through said tube 7 0' p i and'hole, for a vibratory movement by said 

